Oil Pressure Fluctuation
 

I have a 1994 Cherokee 4.0 l which the dash oile pressure gauge seems to
fluctuate.
I have checked the oil and that is at the right level . I get the oil
changed every 10,000 k and there is still 2,000 to go till the next change
.. what do you guys think could be wrong ?.The oil pump need work ?.
Thanks in advance
Neil in NZ